[bug #59230] Conditional assigment of a target specific variable prevents export

[Dmitry Goncharov]

URL:
  <https://savannah.gnu.org/bugs/?59230>

                 Summary: Conditional assigment of a target specific variable
prevents export
                 Project: make
            Submitted by: dgoncharov
            Submitted on: Tue 06 Oct 2020 10:38:50 PM UTC
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: None
        Operating System: None
           Fixed Release: None
           Triage Status: None

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Details:

I user reported a bug here

https://lists.gnu.org/archive/html/bug-make/2020-10/msg00001.html


Hi,

I just got a build failure in lz4.  I've isolated it and made a minimal test 
case, see below.

This is on GNU Guix on a x86_64 machine.

The reason is that apparently one Makefile rule can unwittingly change how 
another unrelated rule functions, IF a submake is involved.

To reproduce:

$ cat Makefile 

all:
        $(MAKE) -C foo all

dummy: CFLAGS ?= bar
dummy:

$ cat foo/Makefile 

CFLAGS ?= internal

all:
        echo $(CFLAGS)

Expected behavior:

$ CFLAGS=ok make
make -C foo all
make[1]: Entering directory 'foo'
echo ok
ok
make[1]: Leaving directory 'foo'

Actual behavior:

$ CFLAGS=ok make
make -C foo all
make[1]: Entering directory 'foo'
echo internal
internal
make[1]: Leaving directory 'foo'

BR,
   Danny Milosavljevic




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